On-Level Chemistry Midterm Review

How many atoms are in a sample containing 3.50 moles of sulfur?

• 1.16 x 10^23
• 2.11 x 10^24
• 21.07 x 10^24
• 0.58 x 10^23

How many atoms are in a 227 g sample of silver?

• 2.10 atoms
• 24,289 atoms
• 4,034 atoms
• 1.267x10^24 atoms

How many atoms of oxygen are there in 15.7 moles of CO2?

• 94.514 atoms
• 1.89 x 10^25 atoms

• 0.357 atoms
• 0.713 atoms

How many double bonds are in the Lewis structure for carbon dioxide, CO2?

• 0
• 1
• 2
• 3

Which of the following substances is correctly named with its formula.

• NF3 → nitrogen fluoride
• MgBr2 → magnesium dibromide
• Ca(OH)2 → calcium hydroxide
• CO2 → carbon oxide

Tags

NGSS.MS-PS1-1

What is the formula for lithium iodide?

• ILi
• LiO3
• LiI
• LiI2

What is the formula for magnesium bromide?

• Mg2Br2
• MgBr
• Mg2Br
• MgBr2

Tags

NGSS.MS-PS1-1

What is the formula for iron (IV) sulfide?

• Fe4S
• FeS2
• Fe2S
• FeS4

Tags

NGSS.HS-PS1-2

What is the formula for copper (III) nitride?

• CuN
• Cu3N
• CuN3
• Cu3N3

Which of these is formed when Mg+2 and OH-1 bond?

• Mg2OH
• Mg(OH)2
• MgOH
• Mg(OH)

Tags

NGSS.MS-PS1-1